持续减少湾区CO2排放量 2018-2022 年
Naomi G Asimow1, Alexander J Turner1, Ronald C Cohen1,2
1Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, California 94720, United States.
Environmental science & technology
|April 4, 2024
概括
一个传感器网络和贝叶斯分析显示,旧金山湾区的城市二氧化碳 (CO2) 排放量从2018年到2022年每年下降1.8%,主要是由于汽车电气化.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 城市生态城市生态学
背景情况:
- 城市是全球二氧化碳 (CO2) 排放的主要贡献者,需要精确量化城市排放和趋势.
- 评估减排政策和了解城市生物圈动态需要强大的方法来测量,报告和验证 (MRV) 城市CO2.
- 现有的城市二氧化碳排放MRV方法在成本效益和准确性方面存在局限性.
研究的目的:
- 通过密集的传感器网络和贝叶斯反转来证明一种具有成本效益和准确的方法来评估城市二氧化碳排放趋势.
- 量化旧金山湾区城市二氧化碳排放在五年期间的年度趋势.
- 将观察到的二氧化碳排放趋势归因于特定行业,例如乘用车电气化.
主要方法:
- 伯克利环境空气质量和二氧化碳网络 (BEACO2N) 的部署,这是一个空间密集的传感器网络,用于持续的二氧化碳观测.
- 从传感器获得的二氧化碳度数据与气象信息的整合.
- 应用贝叶斯反转技术来合成测量和估计二氧化碳排放.
主要成果:
- 在旧金山湾区近五年 (2018-2022) 收集了连续的二氧化碳观测数据.
- 贝叶斯反转分析显示,城市二氧化碳排放量年均下降1.8±0.3%.
- 来自乘用车的道路排放量以每年2.6±0.7%的速度出现了更大的下降,这表明对整体趋势的主要贡献.
结论:
- 密集的传感器网络与贝叶斯反转相结合,为监测城市二氧化碳排放提供了有效和成本效益的方法.
- 旧金山湾区的城市二氧化碳排放量大幅减少,主要是由于乘用车的电气化.
- 这种方法提供了一个可扩展的解决方案,用于跟踪气候政策的有效性和了解城市碳循环.
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